1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.mapping.constraint.instructions;
14 import gnu.trove.set.hash.TIntHashSet;
16 import java.util.ArrayList;
17 import java.util.Collection;
18 import java.util.Iterator;
20 import org.simantics.db.ReadGraph;
21 import org.simantics.db.Resource;
22 import org.simantics.db.Statement;
23 import org.simantics.db.exception.DatabaseException;
24 import org.simantics.layer0.Layer0;
26 public class TripletPredicateQuery extends TripletInstruction {
30 public TripletPredicateQuery(int variable0, int variable1, int variable2,
32 super(variable0, variable1, variable2);
33 this.predicate = predicate;
36 public TripletPredicateQuery(int variable0, int variable1, int variable2) {
37 super(variable0, variable1, variable2);
41 public Object query(ReadGraph g, Object[] bindings) throws DatabaseException {
42 Resource r0 = (Resource)bindings[variable0];
43 Resource r2 = (Resource)bindings[variable2];
44 Collection<Resource> result = new ArrayList<Resource>();
47 g.getStatements(r0, Layer0.getInstance(g).IsWeaklyRelatedTo) :
48 g.getStatements(r0, predicate))
49 if(stat.getObject().equals(r2))
50 result.add(stat.getPredicate());
52 return IInstruction.FAILURE;
53 Iterator<Resource> it = result.iterator();
54 bindings[variable1] = it.next();
61 @SuppressWarnings("unchecked")
63 public Object next(ReadGraph g, Object[] bindings, Object continuation) {
64 Iterator<Resource> it = (Iterator<Resource>)continuation;
66 bindings[variable1] = it.next();
73 return IInstruction.FAILURE;
77 public void collectVariables(TIntHashSet reads, TIntHashSet writes) {
78 super.collectVariables(reads, writes);
79 writes.add(variable1);